Abstract: A magazine extender is provided. The magazine extender includes a baseplate structured to receive a lower open end of a magazine; a side bracket structured to couple to the baseplate for securing the magazine; and a locking pin selectively moveable into a locked position to lock the side bracket to the baseplate and an unlocked position to unlock the side bracket from the baseplate. The locking pin of the magazine extender is prevented from being moved to the unlocked position by a handgrip of a firearm when the magazine is inserted into the handgrip.

Abstract: A number of embodiments of a firearm are disclosed where the firearm includes a magazine configured to hold the bolt in an open position when the magazine is empty. In one embodiment, the firearm includes a bolt stop mechanism that moves between a first position where it allows the bolt to cycle between an open position and a closed position and a second position where it holds the bolt in the open position. The magazine is configured to actuate the bolt stop mechanism to the first position when the magazine is empty.

Abstract: The present disclosure relates to a modular firearm frame adapter that aid in making compatible a slide associated with a first firearm and a frame associated with a second firearm. The compatibility is such that the slide associated with a first firearm and a magazine associated with a second firearm being able to function properly as a single integrated firearm. This system includes an adapter, and one or more adapter elements that aids allowing the modular firearm to function properly.

Abstract: A firearm reliability system may include a charging handle insert and a variable bolt weight assembly. Other components of a firearm reliability system may include, but are not limited to, a buffer pressure plug, extractor springs, firing pin springs, one or more firing pins, and bolt buffers. The firearm reliability system may address weaknesses in the common rimfire AR bolt system. Using the firearm reliability system, malfunctions may be essentially eliminated. Each component of the firearm reliability system plays a part and interfaces with the others (i.e., the bolt weight spreads the impact on the buffer into a larger area, while reducing the speed at which the bolt impacts the backplate, which then reduces the energy transferred to the buffer pressure plug and thus the impact with the lower receiver).

Abstract: A firearm magazine grip with an integrated illumination device and targeting device includes an elongated handgrip body having an open back end with a generally U-shaped channel extending from the top end to the open bottom end. The channel includes a shape and size for engaging a firearm magazine well, and a firearm connector is positioned along the top end of the handgrip body. A first elongated channel is disposed along one side of the handgrip body for housing a flashlight having multiple color output and strobe operation. A second elongated channel is disposed along the other side of the handgrip body for housing a laser pointer.

Abstract: The present invention relates to systems and methods for reliably limiting the cartridge loading capacity of firearm magazines. In one embodiment, a magazine capacity limiting assembly includes a limiter body and a limiter base. The magazine capacity limiter body reliably operates with a cartridge follower of a firearm magazine. The limiter body is installed substantially within coils of the magazine's spring, thereby limiting the travel of the follower within the magazine body to limit the magazine's cartridge capacity. The limiter body includes at least one removable and stackable component configured to enable a corresponding plurality of cartridge capacities for the firearms magazine. The limiter may also include a cupped top configured to be securely coupled the cartridge follower of a corresponding type of firearm.

Abstract: A magazine for feeding ammunition to a firearm includes a tube surrounding a longitudinal axis and defining a central space for receiving the ammunition. The tube has first and second ends. A follower is slidably movable within the tube. A butt plate is removeably attached to the first end. The butt plate defines a bore. A plunger is movably positioned within the bore and includes a first mounting cam. A first catch, mounted on the butt plate, is engageable with the tube proximate to the first end. The first catch is movable relative to the butt plate in a direction transverse to the longitudinal axis. The first catch includes a cam follower engageable with the first cam. A spring acts between the plunger and the follower for biasing the plunger toward the butt plate and the follower toward the second end.

Abstract: An apparatus for extending the magazine well of a firearm has extender body dimensioned to receive a firearm magazine and an expandable securing mechanism coupled to the extender body and selectively expandable against the internal cavity adjacent the magazine well on most firearms. Movement of a driving element in the expandable securing mechanism causes an expandable member thereof to transition from a first unexpanded configuration to a second expanded configuration for frictionally engaging interior surfaces of the internal cavity, and vice versa.

Abstract: A magazine well for receiving a portion of a firearm magazine. The magazine well includes a cavity for receiving the portion of the magazine, the cavity having an input end and a second end opposite the input end. The cavity further includes a channel extending from the input end to the second end, wherein the channel has a tapered portion with a larger cross-sectional diameter closest to the input end of the cavity.

Abstract: Systems and methods herein relate to a safety magazine for blank ammunition or “blanks”. In one illustrative implementation, a specially-shaped follower is utilized to engage and advance the blank ammunition without jamming, i.e., when holding and feeding blank cartridges into the chamber of a firearm. In other implementations, integrated/unitary magazines including such a follower are disclosed, which also prevent jams otherwise common in the field of magazines converted to handle blank rounds of ammunition. According to such implementations, live ammunition or cartridges are prevented from being loaded into the magazine and a specialized follower that prevents the ammunition form jamming is provided.

Abstract: A bolt action AR rifle can be prepared using a standard AR lower assembly and coupling it to a bolt action upper assembly. The bolt action upper assembly has a bolt action receiver containing a bolt. The method of forming a bolt action AR rifle can include: providing the bolt action upper receiver assembly; providing the standard AR lower AR receiver assembly having a pivot pin and takedown pin; inserting the pivot pin into the pivot pin receiver hole; pivoting the bolt action upper receiver assembly at the pivot pin until the takedown pin is aligned with the takedown pin receiver hole; and inserting the takedown pin into the takedown pin receiver hole.

Abstract: A firearm training tool having a shot indicating system configured to provide a training rifle with a shot indicating laser activated by pressing a trigger rearward.

Abstract: An ergonomic self-cleaning base plate, which has an exterior face with a perimeter edge. Extending from the perimeter edge is a forward face and an aft section. The magazine floor plate further has an interior face having at least one channel that extends from the forward face to the aft section. Debris accumulated within the at least one channel exits therefrom via the aft section. The forward face extends to an edge and has at least one channel hole. The at least one channel hole aligns with a respective at least one channel. The debris accumulated within the at least one channel also exits from the at least one channel hole.

Abstract: A customizable firearm lower receiver includes a lower receiver body having a forward end and a rearward end, the forward end having a first lateral sidewall and an opposing second lateral sidewall, with a forward end wall between the first lateral sidewall and the second lateral sidewall. The opposing lateral sidewalls at least partially surround a magazine well. A mounting surface is configured on the lower receiver body along one of the forward end wall, first lateral sidewall, and second lateral sidewall. A custom face is removably attachable to the mounting surface.

Abstract: A magazine for a firearm is formed by a magazine box with a spring therein. A magazine follower in the magazine box is urged toward an open end thereof by the spring, and is formed by a base member extending along a longitudinal axis of the magazine box, and slide stop actuating and cartridge engaging structures extending outwardly from the base member. The slide stop actuating and/or the cartridge engaging structures are resiliently biased in a lateral direction away from a longitudinal axis of the base member to be movable between: (1) a compressed position wherein a longitudinal axis of the slide stop and/or the cartridge engaging structures are laterally perpendicular with the longitudinal axis of the base member, and (2) an uncompressed position where the longitudinal axis of the slide stop actuating and/or the cartridge engaging structures are not laterally perpendicular with the longitudinal axis of the base member.

Abstract: A weighted body adapted for insertion into an existing gun magazine shell approximates the weight and/or density of live ammunition cartridges. The size and shape of the body allows for insertion down and into the slot at the top on the magazine, pressing down on the spring, with a sliding retainer stop or other feature to maintain the weight in position, filling or partially filling the internal volume of the magazine with the weight. The integral slide retainer stop attached at the top of the device is then moved or slid by the operator into a position that locks the weight into the magazine so it cannot pop back out due to spring pressure and will not interfere with other workings of the gun slide or receiver. A plurality of color-coded stops may be provided for use with the same or different weighted bodies corresponding to different calibers of ammunition.

Abstract: An integrated magazine and bolt release mechanism that is intended to automate the operations of magazine release when empty, and bolt release when a loaded magazine is inserted into the rifle. The release mechanism may include a mechanical switch device. The mechanical switch device may be a lever that is able to identify the presence of ammunition. By way of mechanical linkage, the system is able to control the magazine catch surface to either maintain or expel a magazine. The linkage facilitate the transition of vertical motion, imparted by the magazine body and follower to the lever into horizontal motion of an arm to move the magazine catch in and out of engagement with the magazine's locking surface. Upward vertical motion of the lever may actuate the bolt catch surface by means of a mechanical link that serves to reverse the direction of vertical motion. As the magazine body moves upward, the lever impinges on the arm that forces the bolt catch downward, to release the locked bolt group.

Abstract: A magazine for a firearm can have a housing defining a cavity with a biased follower arranged therein. The magazine may be configured to be received within a magazine well coupled to the receiver of the firearm so that rounds of ammunition stored in the magazine can be fed into the chamber of the firearm. In addition, multiple spacers can be received within the cavity defined by the magazine housing, which spacers may be configured to change or alter a width, dimension, size, and/or configuration of the magazine housing to allow the magazine to store and feed various and/or different caliber, length, size, and/or types of ammunition.

Abstract: Systems and methods herein relate to a safety magazine for blank ammunition or “blanks”. In one illustrative implementation, a specially-shaped follower is utilized to engage and advance the blank ammunition without jamming, i.e., when holding and feeding blank cartridges into the chamber of a firearm. In other implementations, integrated/unitary magazines including such a follower are disclosed, which also prevent jams otherwise common in the field of magazines converted to handle blank rounds of ammunition. According to such implementations, live ammunition or cartridges are prevented from being loaded into the magazine and a specialized follower that prevents the ammunition form jamming is provided.

Abstract: Magazine loaders for sequentially loading cartridges into an uppermost cartridge space of a magazine are disclosed. A magazine loader may comprise a housing including a plurality of wall portions defining a housing cavity. The wall portions may define opposing arcuate pin receiving channels. The magazine loader may also include a pin and a tool. The pin may include a starboard end and a port end. The starboard end of the pin may be disposed inside a starboard channel and the port end of the pin may be disposed inside a port channel so that translation of the pin is constrained to movement along a path defined by the channels. An intermediate portion of the pin may extend through the bore defined by a central portion of the tool so that the tool is supported by the pin and the tool follows the path defined by the channels.

Abstract: A firearm and a jig for modifying or constructing a firearm with a locking magazine release button is provided. The firearm has a lower receiver including a magazine locking pin aperture disposed in an upper surface thereof where the magazine locking aperture intersects with a magazine release button aperture in a side surface of the lower receiver. The firearm also has an upper receiver attached to the lower receiver via a pivot pin, a magazine attachable to the lower receiver, a magazine locking pin inserted into the magazine locking pin aperture, and a magazine release button comprising a recessed locking catch. The magazine release button releases the magazine when the upper receiver is away from the lower and the pin is not in the magazine locking aperture. The button is inoperable when the upper receiver is next to the lower receiver and the pin engages the locking catch.

Abstract: A slide assembly quick release pin and arm that secure a recoil assembly within a slide. The pin is inserted through a pair of apertures in a front portion of the slide and through a bore in the nose portion of the recoil assembly aligned between the apertures. As the pin secures the recoil assembly within the slide an arm attached to the end of the pin rests in a recess, flush to the body of the slide in a locked orientation. The pin arm is rotated from a locked orientation within the recess in the assembled configuration to an unlocked orientation out of the recess before the firearm is disassembled. Additionally, the arm acts as a handle for grasping and rotating to provide a mechanical advantage when a user is removing or inserting the pin into the apertures and bore.

Abstract: A discharge blocking device compatible with a firearm that has a magazine housing. The safety magazine comprises a cover that has a shape compatible with the magazine housing, a base that covers a locking mechanism, and a locking element that at least partially accommodates inside the cover. The locking element is configured to allow blocking the trigger of the firearm. A method for locking a magazine to a firearm and preventing accidental discharge is disclosed. The method comprises providing a cover, that has a shape compatible with the magazine housing, providing a base, covering a locking mechanism, providing a locking element, and inserting the cover into the magazine housing, wherein the locking element is configured to allow blocking the trigger.

Abstract: An assembly for a firearm includes a magazine well with an adjustable inner volume for accepting magazines of different projectile calibers.

Abstract: A gun device with bolt catch, having a receiver including a bolt chamber and magazine well, comprising: a magazine, bolt, and bolt catch. The magazine includes a follower and bolt lock trigger. The magazine and bolt are disposed in the magazine well and bolt chamber, respectively. The bolt catch, which includes an engaging body, is disposed through a lateral surface thereof on the receiver and located at either an initial position or engaging position. Positioning the follower at a first position allows the follower to be positioned beside the bolt lock trigger, extends the bolt lock trigger from the magazine by a height, moves the bolt catch, positions the engaging body beside the bolt, positions the bolt catch at the engaging position, and fixes the bolt in place at an open position.

Abstract: Systems and methods herein relate to a safety magazine for blank ammunition or “blanks”. In one illustrative implementation, a specially-shaped follower is utilized to engage and advance the blank ammunition without jamming, i.e., when holding and feeding blank cartridges into the chamber of a firearm. In other implementations, integrated/unitary magazines including such a follower are disclosed, which also prevent jams otherwise common in the field of magazines converted to handle blank rounds of ammunition. According to such implementations, live ammunition or cartridges are prevented from being loaded into the magazine and a specialized follower that prevents the ammunition form jamming is provided.

Abstract: Systems and methods herein relate to a safety magazine for blank ammunition or “blanks”. In one illustrative implementation, a specially-shaped follower is utilized to engage and advance the blank ammunition without jamming, i.e., when holding and feeding blank cartridges into the chamber of a firearm. In other implementations, integrated/unitary magazines including such a follower are disclosed, which also prevent jams otherwise common in the field of magazines converted to handle blank rounds of ammunition. According to such implementations, live ammunition or cartridges are prevented from being loaded into the magazine and a specialized follower that prevents the ammunition from jamming is provided.

Abstract: A magazine for a firearm comprises a tubular body defining a cavity for holding cartridges, a spring, and a follower biased by the spring for dispensing cartridges from the magazine. In one embodiment, the follower includes lateral guide projections which engage corresponding slots in the sidewalls of the magazine body. This guides movement of the follower and maintains a substantial horizontal orientation as it travels vertically in the magazine by preventing twisting/tilting which might otherwise create potential cartridge feeding jams. In some embodiments, the follower may include front and rear stabilizer projections to further guide movement of the follower in the magazine cavity.

Abstract: A magazine well grip is configured to be self-retained on the front portion of the magazine well of the lower receiver for an AR type rifle or pistol. The magazine well grip includes a body that generally tapers outward from top to bottom, and includes a rib on an inner surface to contact the magazine well and maintain space between the magazine well and the inner surface of the magazine well grip. At least some of the ribs include an integrally formed retaining feature for engaging the lip of the magazine well which, in conjunction with a retaining tang that protrudes from the top of the body to engage a hinge pin boss, operates to retain the magazine well grip on the magazine well.

Abstract: A conversion kit for converting an AR-15 rifle to shoot 9 mm rounds is provided. The kit comprises an upper receiver; a weighted bolt carrier operatively coupled within the upper receiver; a bolt coupled in a fixed position within the bolt carrier; and a spring biased firing pin, operatively coupled within the bolt. The weighted bolt carrier is weighted at a rear end of the bolt carrier. The bolt is coupled within the bolt carrier by use of a bolt key, wherein the bolt key and the weighted bolt carrier convert the rifle to a blowback system. The kit further comprises a magazine that comprises and outer case, an insert, a follower and a spring. The outer case of the magazine is a .223 in. outer case. Further still, the follower slides within a compartment defined on three sides by the outer case and the insert on the fourth side.

Abstract: A combination metal/polymer upper receiver for use in a rifle, with the upper receiver attachable to a lower receiver and to a barrel. The upper receiver comprises a polymeric upper receiver housing defining a chamber. The polymeric upper receiver housing is adapted to engage with mounting features on the lower receiver to attach a lower receiver to the upper receiver at a first connection. A metal insert is secured within the polymeric upper receiver housing and is adapted to engage the barrel. The metal insert further includes an extended member embedded within the polymeric upper receiver housing such that the extended member receives the impact from a bolt carrier group residing within the chamber. An optional metal gas tube channel is located along an upper internal surface of the polymeric upper receiver housing and extends the length of the polymeric upper receiver housing.

Abstract: A selectable double-chamber magazine firearm is disclosed. The double-chamber magazine firearm includes a receiver, at least one barrel adjacent the receiver, and a double-chamber magazine releasably secured to the receiver. The double-chamber magazine includes a first elongate magazine chamber and a second elongate magazine chamber adjacent to and parallel with the first elongate magazine chamber. The firearm further includes a selector secured adjacent an open end of the first elongate magazine chamber and an open end of the second elongate magazine chamber. The selector is configured to move between a first position such that the selector at least partially obstructs the open end of the second elongate magazine chamber and a second position such that the selector at least partially obstructs the open end of the first elongate magazine chamber.

Abstract: The present invention is a modified magazine adapted to prevent live ammunition from being loaded therein and subsequently chambered into and discharged from a firearm. The magazine includes a restriction plate positioned within a cavity of the magazine and securely coupled to an interior surface of a front wall of the magazine. The restriction plate has a thickness sufficient to reduce the size of the opening of the magazine and prevent the loading of a live round into the magazine. The length of the modified opening, as reduced by the thickness of the restriction plate, is less than the length of the live round of ammunition, thereby preventing loading and/or feeding of a live round of ammunition into the magazine and further preventing discharge of a live round from the firearm. The reduced size of the opening is sufficient to receive only blank rounds of ammunition.

Abstract: A modified elongate ammunition magazine, the magazine being modified by modifying an elongate, single plane magazine by removing its end cap so as to provide an elongate modified magazine having an upper end for attaching to said magazine well of a firearm, a lower end, and a through passageway therebetween, and a clip leg base attached thereto and also attachable to a high capacity ammunition magazine housing, the clip leg base configured such that when it is attached to said modified magazine to construct a feed clip assembly, and when the clip leg base is also attached to a high capacity magazine, and when the upper end of the modified magazine is installed into a firearm, an ammunition passageway is defined from an ammunition outlet of a high capacity ammunition magazine housing, through the modified magazine, and to a firearm. Also provided is a last linked assembly including a loose or spreadable link.

Abstract: Apparatuses for converting magazine-loaded weapons into low capacity weapons and apparatuses for locking magazine-loaded weapons are disclosed. The apparatuses may be loaded into the magazine well of a magazine-loaded weapon and may be reversible secured in place. Removal of the apparatuses requires a tool to disengage the apparatuses from the magazine well. The apparatuses may each include a body configured to be inserted into the magazine well of the firearm having a cross-sectional shape that corresponds to the interior cross-sectional shape of the magazine well, a securing mechanism in the body for securing the body within the magazine well, and a tool disjoined from the apparatus and the firearm and operable to engage the securing mechanism. The conversion apparatuses may include a seat in a fixed position on an upper portion of the body for receiving and positioning at least one cartridge of the firearm.

Abstract: Example cartridge magazines for use within a curved handle of certain pistols have a laterally curved housing so that the pistols and magazines can fit comfortably along a user's body. Such curved pistols and magazines are particularly suited for carrying within a shirt or pants pocket. A curved pistol loaded with a curved magazine, for instance, can be carried comfortably in one pocket while an extra loaded magazine can be carried in another pocket. Example magazines carry single and multiple rows of cartridges along appropriately sized curved housings. The magazine's curvature provides a user with a prominent tactile feature that quickly indicates in which direction the magazine should be inserted within the pistol.

Abstract: An ammunition magazine base pad retaining plate is provided with a protrusion including a shaft portion, a flange portion having a lager cross sectional diameter than the shaft portion, and a longitudinal slot to allow lateral compression. When attached to a magazine base pad in a magazine assembly, the configuration of the base pad retaining plate eliminates the possibility that the base pad retaining plate will disengage from the base pad resulting in catastrophic disassembly of the ammunition magazine.

Abstract: A device for modifying an existing high capacity magazine to reduce the friction between the bolt and the cartridges and assure more reliable feeding, by biasing the cartridge into the feed position in a manner independent of the magazine's primary spring pressure.

Abstract: A magazine adapter includes a base that is structured to fit within the magazine well of a firearm, and to accept a magazine designed for smaller caliber ammunition than the original firearm. The adapter includes a bolt catch actuator slidably mounted therein. Magazines for which the adapter is intended include an upwardly extending rear projection of the follower, projecting from an opening in the rear of the magazine housing when the follower is in an upper portion of the magazine. When the upwardly extending projection pushes upward on the bolt catch actuator, the bolt catch is actuated, holding the firearms bolt in a rearward position. The magazine adapter thereby facilitates use of the original firearm controls with a caliber conversion unit, or with an upper receiver and barrel combination of a different caliber.

Abstract: A variable capacity modular firearm magazine includes one or more modular magazine bodies, each having connectors to allow the plurality of bodes to be removably secured together in a vertical manner, a receiver member having a coupler that is removably secured to the uppermost magazine body, a baseplate having a coupler that is removably secured to the lowermost magazine body, and a cartridge engagement unit that is disposed within each of the bodies and receiver member.

Abstract: The present invention involves techniques for rapid, flexible, partial and supplemental reloading of firearms using specialized actions, intermediate storage devices/feeds and multiple magazines, which may, in some embodiments, be simultaneously engaged with a firearm. The techniques disclosed include a feeding system, which may be a multiple-magazine feeding system, that allows a firearm to remain loaded and firing-ready with multiple loaded cartridges at all times, even during reloading operations. The invention also includes other techniques for flexible, non-wasteful, partially-empty reloading, to eliminate reloading paralysis, and allow the soldier or other user, not the size of a magazine, to determine when firing should continue and when and if it should pause.

Abstract: A magazine for a firearm comprises a magazine shell and a main magazine spring. The magazine shell includes a first end, a second end opposite the first end, and sidewalls between the first end and the second end. The first end includes an opening and is configured to attach to the firearm. The second end includes a bottom plate. The main magazine spring includes a first end and a second end opposite the first end. The second end of the main magazine spring is coupled to the bottom plate of the second end of the magazine shell.

Abstract: A compact firearm spring arrangement within a firearm magazine utilizes two or more springs connected in a linear arrangement by a connecting cup that allows one spring to compress within the other, thereby resulting in a free length spring system having a reduced height when fully compressed while maintaining sufficient force for operation of the firearm. The reduced height of the spring when fully compressed allows for additional bullet storage space within a magazine of standard size or, alternatively, a more compact system within a magazine that provides an equal amount of bullet storage space while reducing the friction of operation of the firearm.

Abstract: A magazine release assist tool is described comprising of a generally U-shaped clip having an integrated arm extension. The tool is used to assist in the release of a magazine from a firearm that is equipped with a magazine release blocking mechanism. The clip is removably secured to the lower receiver of a firearm and the arm extension is provided to form a resilient flat spring having a pivot at its proximate end and a push pin at its distal end. When attached to the firearm, a user can depress the flat spring such that the push pin will engage the magazine release button of the firearm allowing quick removal of the magazine.

Abstract: A magazine for a firearm is adjustable for cartridge capacity using a thumb slide to select the quantity of cartridges to be held by the magazine. The thumb slide is operable in a vertical slot and below the carriage pushing up on the bullets. The thumb slide protrudes into the internal chamber through the vertical slot so as to form an obstruction preventing downward movement of the carriage beyond the obstruction. Alternatively, the thumb slide raises a platform on which a segmented spring rests. When the platform is raised, it reduces available storage in the magazine. If a capacity selection requires a smaller spring, then spring segments are removed. A set screw locks the thumb slide in place. An indicator bar shows through holes in the magazine indicating the number of cartridges remaining in the magazine. A bolt and nut is introduced to permanently prevent further adjustment.

Abstract: A magazine for storing and dispensing cartridges to a firearm. In one embodiment, the magazine includes a tubular body, a compression spring, and a two-piece follower including a first follower moveable within the magazine and a second follower disposed below the first follower. The second follower may be movable independently of the first follower and is engaged by the compression spring which applies a biasing force towards an open top end of the magazine. The second follower includes a base plate having an upward extending flange configured and dimensioned for slidable insertion through a slot formed in the first follower. The second follower is operable to project the flange through the slot to contact and assist with ejecting the last spent cartridge case in the magazine. In one embodiment, the firearm may be a pistol.

Abstract: A magazine for a firearm is adjustable for cartridge capacity using a thumb slide to select the quantity of cartridges to be held by the magazine. The thumb slide is operable in a vertical slot and below the carriage pushing up on the bullets. The thumb slide protrudes into the internal chamber through the vertical slot so as to form an obstruction preventing downward movement of the carriage beyond the obstruction. Alternatively, the thumb slide raises a platform on which a segmented spring rests. When the platform is raised, it reduces available storage in the magazine. If a capacity selection requires a smaller spring, then spring segments are removed. A set screw locks the thumb slide in place. An indicator bar shows through holes in the magazine indicating the number of cartridges remaining in the magazine. A bolt and nut is introduced to permanently prevent further adjustment.

Abstract: A firearms magazine has compound tapered side walls and feed lips having substantially parallel end portions for maintaining contact with the cartridge as it is loaded. Removable inserts reduce the interior length and width to hold cartridges of different sizes. The insert has a channel along its height to protect the cartridge noses, and is held by a reinforcing member. A movable cartridge follower feeds the cartridges out of the magazine and has projections slideable in channels of the insert.

Abstract: A firearm includes a barrel having first and second ends, and is adapted to fire a round of ammunition from the second end. A handgrip is operatively coupled to and extending in a downward direction relative to the barrel. An ammunition magazine is removably received within the handgrip. The magazine includes a front, a rear, and a pair of opposed side surfaces extending between the front and rear. A clip member includes at least an arm portion extending along the rear of the magazine. The arm portion of the clip member is adapted to allow the ammunition magazine to be temporarily attached to an object while outside of the magazine.

Abstract: An ammunition magazine with an improved base locking, including: a hollow magazine body, a follower, a spring and a magazine base. The magazine body is equipped with track guides that correspond to grooves embodied on the magazine base, that the magazine base is guided onto. The spring is spirally embodied such that the first turn fully encompasses the surface of the magazine base and in the compressed state the rest of the spring, without the first turn, can fully fit into the follower pressed by the spring. The magazine base has a catch on one side and a hole positioned next to the catch. The magazine body has a slit allowing the catch to pass unobstructed into the magazine body and catch the detent spot on the spring positioned inside the magazine body. An advantage is improved safety of magazine base locking to the magazine body and simpler construction.